Spine
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Retrospective cohort study. ⋯ 4.
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Cadaveric model. ⋯ N/A.
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Retrospective case series. ⋯ 4.
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Retrospective database review. ⋯ 3.
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A retrospective two-cohort comparative analysis of data collected prospectively in an adult deformity multicenter database. ⋯ 3.